Operation - Liebert LM Series Installation, Operation And Maintenance Manual

Liebert SPD Systems require little or no operator
intervention after installation.
The units are provided with diagnostic indicators and alarms
(optional) which assist in determining when the unit needs
service (see Troubleshooting/Repair/Maintenance Section).
Each active surge current diverter module is equipped with a
green and red LED. If the unit is energized and the green
LED is off (and/or the red LED is on), the surge current
diverter module is not fully functional and requires
replacement. See the maintenance section of this manual for
additional information.
System Monitor Panel – The unit may be equipped with
one or more of the following status indicators or alarms:
GREEN - OK
LM
SERIES
SURGE
SUPPRESSION
LM Standard Features
ALARM
T E S T
ENABLE
DISABLE
LM
SERIES
SURGE
SUPPRESSION
LM Optional Features
Module Status Indicators – These indicators provide a
summary of the status of all surge current diverter
modules. For normal conditions, the green "OK" LED
is luminated and the red "Service" LED is extinguished.
If one or more of the surge current diverter modules
requires replacement, the green "OK" LED is turned off
and the red "Service" LED illuminated.
Installation, Operation
and Maintenance Manual
®

OPERATION

RED - SERVICE
SURGE COUNTER
DISABLE
OK SERVICE
Summary Alarm Contact – Summary alarm Form C (1
N.O. and 1 N.C.) relay contacts are provided for remote
indication of each failed surge current diverter module/s.
For standard units (LED only), access to the summary
alarm contacts are provided via connection to the orange
and yellow 18 gauge conductors, located on the inside of
the panel (see Figure 1).
accessories, access to the summary alarm contacts are
provided via contact terminals located on the printed
circuit board mounted on the inside of the unit's door
(see Figure 1). Contacts are rated for 5 amps at 277
VAC maximum.
Transient Counter (optional) – A single transient counter is
provided for transient voltage surge monitoring. The
counter totalizes surges monitored since the last counter
reset.
The transient counter monitors line to ground transient
voltages. The circuit totalizes all surges that deviate
from the line sine wave envelope by more that 125 volts.
The counter is AC coupled and rejects transients longer
than 100 µs.
Front Panel Counter Reset Disable / Enable Button
(provided on units with Transient Counters only) –
The counter is resettable from the counter reset switch.
The front reset may be disabled internally to provide
protection against tampering. To disable the front reset
follow the procedure below:
1) Remove power from the unit, lock out and tag the
disconnect or circuit breaker.
2) Open door and verify power is off with a voltmeter.
3) Throw SWXI on the power supply board to the
disable position.
Audible Alarm (optional) – If one or more of the surge
current diverter modules requires replacement, an
audible alarm is activated to draw attention to the fact
that repair service is required to restore the system to
normal operation. An audible alarm disable is provided
to silence the alarm. The system will automatically reset
itself after repair.
"Service" LED can be tested by depressing the "Test"
switch on the system monitor panel.
- 10 -
Surge
Suppression
Systems
For units with optional
The audible alarm switch and
LM Series
Rev 0, 5/99